COURSE of the MONTH

Database logon failed. crystal report 2008 in asp.net 3.5

HI,
I have created report in Crystal report 2008 on one PC which is working fine. When I change My PC i.e Copy rpt to another PC with different DB name but same schema, i not able to connect to that DB. Report shows msg as "Database logon failed."
For making work it proper I have written the following code to bind report.
Here I am passing Parameter as encrypted query string.
Query string contains RPT name, Parameter with values of Reports and FORMULAFIELD.
Kindly help me as soon as possible.
Thanks in advance for helping.

i am using admin rights for the same.
Also one more thing... when i created my rpt on first pc, its backend was MS SQL 2005 and when I trying to run it on another pc its backend is MS SQL 2008.
But when I save rpt on another PC then reports runs fine.
I cant do this for every rpt!!!